Throw InvalidBotTokenException when token is rejected by Telegram API

src/Exception/InvalidBotTokenException.php

+<?php
+/**
+ * This file is part of the TelegramBot package.
+ *
+ * (c) Avtandil Kikabidze aka LONGMAN <akalongman@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Longman\TelegramBot\Exception;
+
+/**
+ * Thrown when bot token is invalid
+ */
+class InvalidBotTokenException extends TelegramException
+{
+    /**
+     * InvalidBotTokenException constructor
+     */
+    public function __construct()
+    {
+        parent::__construct("Invalid bot token!");
+    }
+}

src/Request.php

@@ -14,6 +14,7 @@ use GuzzleHttp\Client;
 use GuzzleHttp\Exception\RequestException;
 use Longman\TelegramBot\Entities\File;
 use Longman\TelegramBot\Entities\ServerResponse;
+use Longman\TelegramBot\Exception\InvalidBotTokenException;
 use Longman\TelegramBot\Exception\TelegramException;
 
 /**
@@ -463,7 +464,13 @@ class Request
             throw new TelegramException('Telegram returned an invalid response! Please review your bot name and API key.');
         }
 
-        return new ServerResponse($response, $bot_username);
+        $response = new ServerResponse($response, $bot_username);
+
+        if (!$response->isOk() && $response->getErrorCode() === 401 && $response->getDescription() === 'Unauthorized') {
+            throw new InvalidBotTokenException();
+        }
+
+        return $response;
     }
 
     /**